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RET-mediated cell adhesion and migration require multiple integrin subunits

Jessica G Cockburn1, Douglas S Richardson, Taranjit S Gujral

  • 1Division of Cancer Biology and Genetics, Cancer Research Institute, and Department of Pathology and Molecular Medicine at Queen's University, Kingston, Ontario, Canada.

The Journal of Clinical Endocrinology and Metabolism
|August 13, 2010
PubMed
Abstract

Insights

RET receptor tyrosine kinase (RTK) signaling activates multiple integrin subunits, including beta-1 (ITGB1) and beta-3 (ITGB3), to drive cancer cell migration and invasion. This highlights integrins as key players in RET-mediated diseases.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Signaling

Background:

  • The RET receptor tyrosine kinase (RTK) is implicated in neuroendocrine cancers, where aberrant cell migration is a hallmark.
  • Integrins are critical regulators of cell migration, a process often dysregulated in cancer.

Purpose of the Study:

  • To investigate the role of integrins in RET-mediated cell migration using neural-derived (SH-SY5Y) and thyroid cancer (TPC-1) cell lines.
  • To determine if multiple integrin subunits are involved in RET-driven cell migration.

Main Methods:

  • Assessed integrin expression and activation via cell adhesion and wound-healing assays.
  • Examined integrin activity by analyzing focal adhesion formation using coimmunoprecipitation and immunofluorescence.
  • Evaluated RET-mediated cell migration and invasion in vitro and in vivo mouse tumor xenograft models.

Main Results:

  • Beta-1 integrin (ITGB1) is expressed in both cell lines and mediates cell adhesion to ITGB1-associated matrices.
  • RET activation leads to ITGB1 activation, which is essential for RET-induced cell adhesion and migration.
  • Beta-3 integrin (ITGB3) also contributes to RET-mediated cell adhesion and migration, with its expression correlating with invasion in vivo.

Conclusions:

  • Multiple integrin subunits (ITGB1 and ITGB3) are downstream effectors of RET signaling in cell migration and adhesion.
  • Coordinated signaling through RET and integrins is crucial for cancer cell interactions with the microenvironment during invasion and progression.

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